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Model: 8H0053Brand: AstronomikFilter Type: Light Pollution
Generally In Stock, Please Confirm Before Ordering
Please note that the EOS Clip In fit does NOT fit full frame cameras such as the 5D and 6D. For compatibility queries, please get in touch.
The Astronomik CLS is a budget filter for visual observation, Black & White photography and CCD photographs of nebulae, galaxies and star clusters with astronomical instruments of any size.
We have re-desgined all of our photographic filters. Since the end of 2008 we are shipping our new "Halo-Free" filters. read more...The Astronomik CLS blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass. All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter.
Main useThe filters are optimized for use with aperture ratios from 1:3 to 1:15. Transmission losses and chromatic distortions, which are problems with other filters, only appear with Astronomik filters when extremely bright aperture ratios of 1:2 and more are used. The CLS filter is suitable for use with telescopes of all aperture sizes.
SuitabilityVisual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)Visual observation (urban skies): Good, an UHC-E or UHC filter is more suitableFilm photography: Very good, colour balance is near perfectCCD photography: Good, when used with an additional IR-block-filterDSLR photography (original): Good, colour balance shifted but contrast enhancedDSLR photography (astro modified): Very good, colour balance is near perfectDSLR photography (MC modified): Good, when used with an additional IR-block-filterWebcam / Video (Planets): UnsuitableWebcam / Video (Deep Sky): Very good, if light pollution is a big problem
Technical Data92% transmission at 486nm (H-beta)92% transmission at 496nm (OIII)92% transmission at 501nm (OIII)97% transmission at 656nm (H alpha)pass from 450 to 540nm and beyond 650nmParfocal with other Astronomik filtersGlass thickness: 1mmCompletely resistant against high humidity, scratches and aging effectsDiffraction limited, the filter will not reduce the optical performance of your telescope!Astronomik filters are delivered in a high-quality, long lasting, filter box Available in 1.25", 2" and an EOS Clip fitting
Please be aware, Canon EF-S lenses are not compatible with clip-in versions of this filter. This is because the rear of the Canon EF-S lenses protrude into the camera body which will collide with the filter. 3rd party lenses like Sigma etc don't have this protrusion and are therefore compatible with the filter.
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Some items that are showing as in stock are in stock at our holding warehouses, not at the shop. To double check the stock levels at the shop, please contact us on 01909774369 or email@example.com.
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The delivery costs for courier next day are for mainland UK only. If you live in the Scottish Highlands/Islands, Channel Islands or Northern Ireland, then a shipping surchage will apply. please contact us for prices. Smaller items can still go 1st class via Royal Mail.
Please note that if you are wanting to take advantage of our Saturday and Sunday timed services or next day pre 12 or pre 10:30 services, you MUST check that the stock is here at the shop before placing orders. Also, orders using the Saturday and Sunday services must be placed before 2pm the previous working day. Also, please remember to check that the stock is here at the shop before placing orders. If the stock is not at the shop, we won't be able to ship on any of the timed services.
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Rother Valley Optics
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Rother Valley Optics Ltd is registered in England and Wales 04762707. Registered Office: 21 Station Road, Kiveton Park, Rotherham, S26 6QP. Rother Valley Optics Ltd acts as a credit broker only. Rother Valley Optics Ltd are authorised and regulated by the Financial Conducts Authority. Credit provided subject to age and status..
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